Federal prosecutors outlined information based on forensic work on cell phones belonging to the Tan family. They said it took weeks and thousands of dollars to unlock Charlie and Jean Tan's phones and extract their contents.

The documents allege that Tan ran a business selling drugs on the Cornell University campus. According to phone records, the then-19-year-old sophomore sold marijuana to other students at $200 an ounce, and had a 5-pound shipment of marijuana sent from California. Tan is also accused of selling psilocybin mushrooms and DMT - both of which are psychedelic drugs. All of this appears to have taken place in the early months of 2015.

Prosecutors also said the dozens of letters of support from family and friends do not account for the "murder" of Jim Tan. Instead, documents allege, they focus on how it has negatively impacted Charlie Tan. It also returns to the fact that he "still has not admitted what it is he has done."

As a result of this information, prosecutors said the 5-year prison sentence requested by defense attorneys is, "substantively unreasonable."

The briefing concludes that Tan, "intentionally carried out the pre-meditated murder of his father. He values that crime at 5 years. No reasonable view of the law agrees."